public function __construct($msgid)
 {
     parent::__construct('Message %d does not exist', 0, $msgid);
 }
 public function __construct()
 {
     parent::__construct('no_messages');
 }
 public function __construct($msgid)
 {
     parent::__construct('You are not authorised to view message %d', null, $msgid);
 }
 public function __construct()
 {
     parent::__construct('no_access');
 }